A new TV spot for Guardians of the Galaxy premiered during the MLB all-star game, which focuses on the two (mostly silent) killers of the team, Drax and Gamora.
 
This, along with the previous clips (see "More 'Guardians' Goodies"), pretty well indicates that a tone of humorous miscommunication and snark will probably be a running theme in the movie, which will play well to an all-ages audience.  The only one who won’t like it is Drax, because, as Rocket says "His people are completely literal; metaphors are gonna go over his head."